Warp stop mechanism for looms



y 2, 1929- J. c. VICKERS 1,719,248

WARP STOP MECHANISM FOR LOOKS Filed April 3, 1928 Patented July 2, 1929.

UNITED STATES PATENT OFFICE.

JOHN G. VICKERS, OF EXPERIMENT, GEORGIA, ASSIGNOR T DRAPER CORPORATION, OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

WAR]? STOP MECHANISM FOR LOOMS.

Application. fired April 3,

at the opposite end which usually engages with a pin extending from the transversely n'iovable toothed detector bar. The link connection between the actuator and the toothed detector bar thus readily detached from the detecting bar, which permits the latter to be moved into place in connection with the drop wires and then connected to its actuating mechanism. 011 the other hand,

it, frequently happens during weaving or manipulation of the loom by the loom attendant that one ormore of the detecting ba s maybe accidentally detached from its connection with its actuating means, or, in other cases where the detachment has been made intentionally, the loom attendant may fail to connect the parts together, so that during the weaving ope 'ation one or more .of the banks of drop wires may not function to stop the loom on the breakage or undue slackness of a warp thread.

One of the important features of the present invention is to provide the connection between the actuator and the detector bar with a lock which will act positively to hold the parts in their locked position so that they cannot become accidentally detached, and when intentionally detached the lock itself will sigualthe fact that the parts are disconnected.

The invention and novel features thereof will best be made clear from the following description and the accompanying drawings of one good form thereof.

In the drawings;

Fig. 1 is a viewlooking from the rear of the loom, showing one form of the transverscly movable detector bar warp stop mechanism containing the present invention, some of the parts being o1nitted;

Fig. 2 is an enlarged detail showing the detector and link connection between it and 1928. Serial 1a, 266,914.

its actuator in detached or unlocked position and ready for assembly;

Fig. 3 is an enlarged side elevation of the connection between the detector bar and actuator, partly in section; and

Fig. 4 is a modified form of the lock.

The locking connection between the trans versely movable detector bar and its actuator may be advantageously employed in any usual 'form of this type of warp stop mechanism, but, as indicated in Fig. 1 for illustrative purposes, the warp stop mechanism is of the general type shown in the patent to Davis and Johnson, No. 1,538,625, dated May 19, 1925.

As more fully described in the patent mentioned, the warp stop mechanism conrprises the end supports or brackets 1, one at each side of the loom, between which extend the warp rests or spacing bars 2. Mounted in. a bracket 3 extending from. one of the side supports is the rock shaft 4 to which is connected. the arm 5 which may be actuated through a link 6 and arm 7 from any convenient going part of the loom, as, for instance, a cam on the lower or cam shaft, usual. hilounted upon the rock shaft 4.- is the rocker 8, of which there may be any suitable number corresponding to the numbers of banks of drop wires employed, andmounted upon the rocker 8 is the actuator 9 having pins 10 which rest in seatsin the rocker 8 under the influence ofa spring 11 normally act-ingas set forth and more fully described inthe patent to which atten} tion has been. directed, to maintain the actuator and rocker inoperative relation and yet permit the actuator to come to rest when the tramwersely movable toothed detectoubar towhich it is connected is arrested on the occurrence of a warp fault.

Pivotally mounted'on the rocker at 12 is a finger 13 connected at l l to the actuator,

the construction being such that should the actuator be arrested while the rocker continucs to move, the outer end portion of the finger 13 will be depressed and act through a train of mechanism to effect loom stoppage. In the present instance of the invention, the finger 1b acts upon an arm 15 which rests upon the upperflend portion of plunger 16 associated with a flexible sheathed wire 17 which upon the occurrence of a warp fault is moved longitudinally, as more fully,

V explained in the Davis and Johnson patent,

to effect loom stoppage. It is notnecessary herein to further describe the particulars of the warp stop mechanism in detail since these are all ful'l-y deseribed in said patent and the details of suchmechanism form'no essential part of the present invention.

Extending between the side brackets or supports 1 of the warp stop mechanism is the transversely movable detector bar 18, provided with a series of teeth 19, and associatedwith the movable detector bar 'is the relatively fixed toothed detector bar which 'inventiomthefixed detector bar has an open slot 22 in which .may slide the pin or projection 23 secured .to the movable detector bar 18. 1

'Infthe .present instance of the invention, the projection 23 is constituted as a pin having head portion 24 and a shank portion 25,'both' of which engage the pin 23 and are held'in place relative thereto by a nut 26.

The details of this feature of the invention may be varied to suit conditions of use, but the above-described construction constitutes one good practical form thereof.

Pivotally mounted upon theaetuat-or 9 at 27'is 'a link member 28 preferably formed substantially as an inverted U-shaped member, as indicatedlin- Figs. 2, 3 and 4, to pass above and straddle the upper portion of the adjacent side support or bracket .1. At its opposite end the'li'nk 28is provided with anenl'a'rgedor open socket which may be appropriately formed in thedownwardly extending portion 29 of the link. The enlarged or open socket30 has a side portion 31 which, when the link is associated with the transversely movable detector bar, straddles the'shank 25. of the projection or pin, with .theresult that the actuator will transmit to the movable detector bar its transverse dc :tQGtlHglllOVnlBllh:

As 'hereinbeforeindicated, the present in- .ventioncontemplates.locking means for locking'the' link, in swinging engagement with j the transversely movable detector bar, and

' f as is indicatedin Fig. '2, the locking member 33 is pivotally mounted upon the link or the downwardly extending-member 29 thereof,

at 3 2, and the downwardly extending arm 33 of the lock has an opening 34, the lower wall 35 of which is adapted to pass below the pin or projection extending from the transversely movable detector bar when the lock is moved into its locking position, to thereby close the open end portion of the lock 30 in the link.

As indicated in Fig. 2, the downwardly extending portion 29 of the link is bifurcated, preferably throughout its entire length, as indicated at 36, and the lock is pivotally mounted to swing between the bifurcations thereof.

It is desirable when the lock is in locking position that it may be held in such position, and to this end the lock is provided with a weighted arm 37 which normally tends to move the lock into locking position and hold the lock in such position during weaving. \Vhen the lock is in locking pod tion, as indicated in Fig. 1, the weighted portion 37 ot the lock takes a delta-mined position, preferably horizontal with respect to the straddling portion of the link 28, and when in unlocked position the weighted arm 37 will be raised, as indicated in Fig. 2, to thereby indicate to the loom aitcmlant that the lock is not functioning and that before starting the loom the lock should be moved to its locked position.

From the coi'istruction thus far described it will be apparent that when the link 28 is operatively engaged with the transversely movable detector bar, it may be locked thereto by swinging movement of the lock into locking position, and yet it may be removed from locking position by reverse swinging movemcnt of the lock, in order to permit the warp stop mechanism to be assembled or disassembled as the case may be.

As previously stated, the construction indicated'by Fig. 4 shows a modification wherein the link 28 has its downwardly extending arm39 provided with an open notch or socket 40 for engagement with the pin or projection extending from the movable detector bar 18, and pivotally mounted upon the link 28 is the locking member 41 having an inwardly extending end portion adapted to engage in a suitable recess formed in the head 24 ot' the projection or pin. In order that the swinging lock 41 may not become accidentally detached from its lOcking position, the locking member 41 is formed as a spring arm the spring action of which norma lly'tends to move the end 42 inwardly towards the downwardly extending member 39 of the link, the construction being such that by an appropriate outer pull upon the lower end of the locking member 41 it may be detached from its socket in the head 24 and then swung laterally into dotted line position, Fig. 4, in order to unlock the link from the movable detector bar.

Should the locking member4l be swung to its unlocked position, as indicated by iii) dotted lines, Fig. 4, it Will at once indicate to the loom attendant that the lock is in unlocked position and that probably, also, the link has not been secured to the transversely movable detector bar.

From the construction described it Will. be apparent that the link between the actuator and detector bar may be manually locked and unlocked by swinging movement of the lock upon the link and that the lock itself will normally be moved. into locking position either by a weight or its equivalent, a spring, and that when unlocked it Will visually indicate to the loom attendant that the parts are not in operative position.

What claimed is:

1. In a Warp stop mechanisnnfor looms, the combination of a series of drop wires, :1. transi 'crsely movable detector bar having an actuating projection, an actuator, a connector between the actuato and detector bar ha.v ing a notch for engagement With the projeclion, and a hicking member mounted on the coimector for movement relative thereto into engagement with the projection for posi tively locking; the connector to the projection to insure detecting movement of the movable detector bar during the loom operation.

2. In a Warp stop mechanism for looms, the combination ot a series oi. drop Wires, a transversely movable detector bar having an actuating projection, an actuator, a coni'iectoi." constituted as a link pivotally mounted on the actuator and having a notch for engagement with the actuating projection, and a. locking member pivotally mounted on the link to swing into engagement with the actuating projection :l'or positively locking the link to the projection.

.3. In a \varp stop mechanisnrlior looms, the combination oiii a series of drop Wires, a transversely movable toothed detector bar having a pin extending therefrom, an actuator, a link pivotally mounted at one end on. the actuator and having a notch at its opposite end for engagement with said pin, and a lrafilcinp member pivotally mounted on the link 'lor swinging movement into and out of locking engagement with said pin to insure detecting movement Oil the detector bar during the loom operation. i

l. In a Warp stop mechanism for looms,

the combination of a series of drop Wires, a transversely movable toothed detector bar, an actuator therefor, and means for detachably locking the detector bar and actuator together, comprising a. link mounted on one oil said parts and having a notch, a projection on the other of saidparts :lor engagement with. said notch, a locking member carried by the link For swinging movement relatively thereto into and out o l looking ongagement with the said PIOjl-Chlflll and an indicating signal associated with the lockin e member to indicate the locked or unlocked position oi? the locking member.

5. In a Warp stop mecl'ianism for looms, the combination ol a series of drop Wires, a transversely movable toothed. detector bar, an actuator theretor, and means tor detachably locking the detector bar and actuator together, comprising a link mounted on one of said parts and having a notch, a projection on the other ot said parts for engagement with said. notch, and a. locking member carried by the link or movement relative there to into and. out of lockii'ig engagement with the said projection and normally impelled. yieldingly inl'o locking position.

6. In a warp stop mechanism for looms, the combination ot a series of drop Wires, a transversely mo able toothed detector bar, an actuator therefor, and means for detachably locking the detector bar and actuator together, comprising a link mounted on one of said parts and having a notch, a projection on the other of said parts for engagement with. said notch, and a gravity actuated locking); member carried by the link for swinging movement relative thereto into and out locking engagement with the said projection.

7. In a \varp stop mechanism for looms, the combination of a series of drop Wires, a. transversely movable toothed detector bar having a pin projection, an actuator there'lor, a. link pivotally mounted on the actuator and having an open notch :lor engagement with the pin projection, a lock pivotally mounted on the link to r engagement with the pin projection, and a weight normally acting to im' pol the lock into locking); position.

In testimony whereof, I have signed my name to this specification.

JOHN C. VIGKERS, 

